| 摘要 |
A servo system for use in a disk drive in controlling the position of a read/write (R/W) head with respect to tracks of a disk voids inadvertent over-writing of data on a neighboring track. The disk drive generates a position error signal (PES) indicative of the error, if any, in the position of the head. The servo system includes a controller (10) and a sign comparator (42). The controller is programmed to perform a calibration sequence to determine a value of PESOFFSET corresponding to a 1/4-track head position error in PES, and in subsequent track following operations to use this known relationship between PES and PESOFFSET to accurately control and monitor the position of the R/W head with respect to a given data track. PES and PESOFFSET are added to form a composite position error signal (CPES). The sign comparator is coupled to the controller and provides a signal to the controller indicative of the sign of CPES.
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